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D( x )
5*x+10 = 0
10*x-20 = 0
5*x+10 = 0
5*x+10 = 0
5*x+10 = 0 // - 10
5*x = -10 // : 5
x = -10/5
x = -2
10*x-20 = 0
10*x-20 = 0
10*x-20 = 0 // + 20
10*x = 20 // : 10
x = 20/10
x = 2
x in (-oo:-2) U (-2:2) U (2:+oo)
((7*x-17)/(5*x+10))*((6*x+12)/(10*x-20)) = 0
((7*x-17)*(6*x+12))/((5*x+10)*(10*x-20)) = 0
( 6*x+12 )
6*x+12 = 0 // - 12
6*x = -12 // : 6
x = -12/6
x = -2
( 7*x-17 )
7*x-17 = 0 // + 17
7*x = 17 // : 7
x = 17/7
x in { -2}
x = 17/7
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